Relative start URLs are assumed to be relative to the site root and should
look like ‘some/path’, ‘home’, or even ‘/’. The relative start URL will be
normalized with leading and trailing slashes if they are not provided. The
default relative start URL is ‘/’.

The crawler crawls your site using the Django Test Client (so no network traffic is required!) This
allows the crawler to have intimate knowledge of your Django Code.
This allows it to have features that other crawlers can’t have.